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IB Biology HL B3.2.15 Hl Mammalian Heart Adaptations Questions

Explore labelled heart diagrams, blood-flow sequences and valve questions to practise mammalian heart structure and function in IB Biology HL B3.2.15.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Identify heart chambers, septum, valves and major vessels on labelled diagrams.
  • Draw a labelled heart with connected chambers, valves and vessels, and a thicker left-ventricular wall.
  • Trace blood through the heart chambers and major vessels, including the oxygenated route from pulmonary veins to the aorta.
  • Explain how pressure opens and closes atrioventricular and semilunar valves to prevent backflow and maintain one-way flow.

IB Biology HL B3.2.15 Hl Mammalian Heart Adaptations Questions question 1

[Maximum number: 1]

The diagram shows a section through a human heart with the chambers, valves and main blood vessels.

Figure for Question IB Biology HL B3.2.15 Hl Mammalian Heart Adaptations Questions question 1 — IB Biology HL

What are the functions of X and Y ?

X

Y

To carry oxygenated blood to the
head and body

To prevent backflow into the aorta
when the ventricle relaxes

To carry oxygenated blood to the
head and body

To prevent backflow into the aorta
when the atrium relaxes

To carry deoxygenated blood to
the lungs

To prevent backflow into the atrium
when the ventricle contracts

To carry deoxygenated blood to
the lungs

To prevent backflow into the atrium
when the ventricle relaxes

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